text: function extract(arr, type, prefix) {
    // From: http://phpjs.org/functions
    // +   original by: Brett Zamir (http://brett-zamir.me)
    // %        note 1: Only works by extracting into global context (whether called in the global scope or
    // %        note 1: within a function); also, the EXTR_REFS flag I believe can't be made to work
    // *     example 1: size = 'large';
    // *     example 1: var_array = {'color' : 'blue', 'size' : 'medium', 'shape' : 'sphere'};
    // *     example 1: extract(var_array, 'EXTR_PREFIX_SAME', 'wddx');
    // *     example 1: color+'-'+size+'-'+shape+'-'+wddx_size;
    // *     returns 1: 'blue-large-sphere-medium'
    if (Object.prototype.toString.call(arr) === '[object Array]' &&
        (type !== 'EXTR_PREFIX_ALL' && type !== 'EXTR_PREFIX_INVALID')) {
      return 0;
    }
    var targetObj = this.window;
    if (this.php_js && this.php_js.ini && this.php_js.ini['phpjs.extractTargetObj'] && this.php_js.ini['phpjs.extractTargetObj'].local_value) { // Allow designated object to be used instead of window
      targetObj = this.php_js.ini['phpjs.extractTargetObj'].local_value;
    }
    var chng = 0;
  
    for (var i in arr) {
      var validIdent = /^[_a-zA-Z$][\w|$]*$/; // TODO: Refine regexp to allow JS 1.5+ Unicode identifiers
      var prefixed = prefix + '_' + i;
      try {
        switch (type) {
          case 'EXTR_PREFIX_SAME' || 2:
            if (targetObj[i] !== undefined) {
              if (prefixed.match(validIdent) !== null) {
                targetObj[prefixed] = arr[i];
                ++chng;
              }
            } else {
              targetObj[i] = arr[i];
              ++chng;
            }
            break;
          case 'EXTR_SKIP' || 1:
            if (targetObj[i] === undefined) {
              targetObj[i] = arr[i];
              ++chng;
            }
            break;
          case 'EXTR_PREFIX_ALL' || 3:
            if (prefixed.match(validIdent) !== null) {
              targetObj[prefixed] = arr[i];
              ++chng;
            }
            break;
          case 'EXTR_PREFIX_INVALID' || 4:
            if (i.match(validIdent) !== null) {
              if (prefixed.match(validIdent) !== null) {
                targetObj[prefixed] = arr[i];
                ++chng;
              }
            } else {
              targetObj[i] = arr[i];
              ++chng;
            }
            break;
          case 'EXTR_IF_EXISTS' || 6:
            if (targetObj[i] !== undefined) {
              targetObj[i] = arr[i];
              ++chng;
            }
            break;
          case 'EXTR_PREFIX_IF_EXISTS' || 5:
            if (targetObj[i] !== undefined && prefixed.match(validIdent) !== null) {
              targetObj[prefixed] = arr[i];
              ++chng;
            }
            break;
          case 'EXTR_REFS' || 256:
            throw 'The EXTR_REFS type will not work in JavaScript';
          case 'EXTR_OVERWRITE' || 0:
          // Fall-through
          default:
            targetObj[i] = arr[i];
            ++chng;
            break;
        }
      } catch (e) { // Just won't increment for problem assignments
      }
    }
    return chng;
  }
  